Lubricant



, sulphur dichloride- (S012) and Patented July 28, 1942 LUBRICANT Arnold J. Morway, Rahway, N. J.,

assignor, by

mesne assignments, to Jason, Incorporated, a

corporation of Louisiana No Drawing.. Original application December 24,

1936, Serial No.

Divided and this application September 12, 1941, Serial No. 410,588

8 Claims. (Cl. 252-48) This invention relates to lubricants with qualities enhanced by sulfurized derivatives of isomono-olefinic polymers, such as sulfurized isobutylene polymers, also, particularly the sulfur chloride treated iso-olefin polymers or resins of high molecular weight.

The present application is a division of my co-pending application Serial No. 117,634, filed December 24, 1936, which relates to novel rubber-like products and methods of preparing same. More particularly, it relates to the preparation of sulfurized derivatives of high molec-- ular weight polymers of iso-olefins, such as isobutylene.

It has recently been discovered that plastic or elastic hydrocarbon products, the chemical structure of which may be represented as being an extremely long chain of carbon atoms with a number of short side chains of alkyl groups and hydrogen atoms, the entire product being substantially saturated with respect to hydrogen, can be made by polymerization of lso-oleflnes, particularly isobutylene, in the presence of an active volatile halide catalyst, such as boron fluoride, at low temperature, i, e., below 10 C. and preferably as low as 50 C.'or even 80 C. or lower, using a solvent or diluent such as liquefied propane or ethylene, etc. Such polymers can be made having a molecular weight ranging from 1,000 or 3,000 up to an intermediate range of 10,000 or 25,000 or up to a very high range such as 200,000 or 300,000 or more.

Although these polymers are substantially saturated and are extremely resistant to oxidation and attacked by common chemical reagents, such as sulfuric acid, caustic soda, etc., it has now been discovered, greatly contrary to expectation, that these polymers can be sulfurized or vulcanized to a certain extent.

Broadly, according to the present invention, this high molecular weight hydrocarbon polymer either alone or with a solvent for the polymer is treated with sulphur monochloride (S2C12) or heated to efiect reaction.

Accelerators such as litharge, zinc oxide, organic amines, etc., may be beneficially used to accelerate the action of the polymer and the chloride of sulphur.

The products made according to the above process are somewhat rubber-like in texture and have greater elasticity and tensile strength than the original hydrocarbon polymer before the sulresistant to various chemical agents such as acid, alkalies, oxidizing agents, etc.

This product may be used in various ways, such as oxidation inhibitors, Sligh dispersers and pour depressants in lubricating oils due to its solubility in lubricating oils and its sulphur content. It may also be used as an extreme pressure blending agent for increasing the loadcarrying capacity ofa lubricating oil in which it is blended.

The following example is given for the sake of illustration and without intention of limiting the invention thereto:

10 grams of an isobutylene polymer having an average molecular weight of about 55,000 was dissolved in 54 solvent naphtha and the solution was reacted in an autoclave with 0.5 grams of SzClz at about 100 C. (210 F.) for 4 hours.

Upon evaporation of the naphtha, a dry elasticproduct was obtained which had substantially I greater elasticity and elongation than the original isobutylene polymer.

It is not intended that this invention be limited to any of the specific examples given nor to any theory as to the mechanism of the oper ation of the invention but only by the appended claims in which it is intended to claim all novelty inherent in the invention as broadly as the prior art permits.

I claim:

1. A lubricant comprising a, lubricating oil and a sulfurized isobutylene polymer, said isobutylene polymer having a molecular weight above about 1,000.

2. An extreme pressure lubricant comprising a lubricating oil and a sulfurized high molecular weight product of the low temperature polymerization of an isomono-olefin added in amounts s'uflicient to impart to said lubricating oil extreme pressure properties, said high molecular phurizing treatment. The products are also very 55 weight product having a molecular weight above about 1,000.

3. A lubricating oil composition comprising a lubricating oil blended with a product formed by treating polymerized isobutylene of high 'moleccular weight withsulfur chloride, said product being added to impart extreme pressure characteristics to the lubricating oil composition.

4. A lubricating -'composition comprising a lubricating oil and a sulfur chloride treated hydrocarbon polymer of a molecular weight in excess of 1,000, said polymer comprising a polymerized low molecular weight iso-olefinic hydrocarbon.

5. A lubricant comprising a lubricating oil 8. An extreme pressure lubricant comprising a and a sulfurized isobutylene resin. lubricating oil and a suliurized iso-mono-olefln 6. An extreme pressure lubricant comprising polymer added in amounts sumcient to impart a lubricating oil and a sulfurized isobutylene resto said lubricating oil extreme pressure propin added in amounts sufllcient to impart to said 5 erties. lubricating oil extreme pressure properties.

'7. A lulbricant comprising a, lubricating oil and a suliurized iso-monc-olefln polymer.

ARNOLD J. MORWAY. 

